It doesn't mean that something is erroneously sending data. They only illuminate if you are doing serial communications via USB, not if you have something (like a GPS) plugged directly into digital pins 0 and 1.Īlso note that since the "L" LED is connected via an op-amp, it may illuminate if pin 13 is set to an input in your sketch. Note that the Rx and Tx LEDs are not connected directly to digital pins 0 and 1 on the board (marked Rx and Tx).
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